The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 02, 2013
Filed:
Sep. 18, 2007
Tetsuro Yoshimoto, Kokubunji, JP;
Masaki Nara, Yokohama, JP;
Tetsuro Yoshimoto, Kokubunji, JP;
Masaki Nara, Yokohama, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
When an IPv4/v6 dual stack terminal communicating via TCP on IPv6 fails to promptly switch over to IPv4 after the ICMPv6 fails due to a soft error, the problem should be resolved at the prior stage server rather than on the complicated terminal. The server at a stage prior to the terminal receives TCP packets from the terminal to find the TCP connection status on the terminal. When the terminal connection status is SYN-SENT or SYN-RECEIVED, and the server receives an unaddressed soft error such as ICMPv6 'Destination Unreachable: no route to destination (ICMP type=1: code 0)' for that terminal, the server rewrites the ICMPv6 contents as a hard error such as 'Destination Unreachable: communication with destination administratively prohibited (ICMP type=1: code 1)' and sends it the terminal.